DZ License - Written Test Exam UPDATED
QUESTIONS AND CORRECT ANSWERS
Brakes convert the energy of a moving vehicle into - CORRECT ANSWER heat
Hydraulic Brakes are used on passenger vehicles and use_______ to operate the brakes -
CORRECT ANSWER brake fluid
Air brakes are used on most large commercial vehicles and use _____ to operate the brakes -
CORRECT ANSWER compressed air
A split-second delay in brake reaction is present in ... - CORRECT ANSWER all air
brake systems
Vehicles with air brakes may use either - CORRECT ANSWER drum or disc brakes
Compressed air is a form of stored energy that can be - CORRECT
ANSWER hazardous
Air compressors are powered directly by - CORRECT ANSWER the engine or by
using belts and pulleys
Air compressors are mounted directly on - CORRECT ANSWER the engine or by
using brackets and fasteners
The governor controls - CORRECT ANSWER the air compressor cut-in and cut-out
pressure
The operating pressure range for vehicle air brake systems must be between - CORRECT
ANSWER (80 psi - 135 psi)
, It is unsafe to drive a vehicle when the air pressure is - CORRECT ANSWER outside
the normal operating range.
Compressed air is stored in - CORRECT ANSWER the vehicle's supply or 'wet' tank
and the primary and secondary air tanks
To prevent too much moisture and oil from collecting, - CORRECT ANSWER the air
tanks must be drained regularly
Air pressure gauges indicate air pressure in - CORRECT ANSWER the vehicle's
primary and secondary air tanks
Safety valves prevent - CORRECT ANSWER overpressure of the air brake system
Low air pressure warning devices give drivers - CORRECT ANSWER a visual &
sometimes audible warning that air pressure is dangerously low
An air dryer removes moisture from - CORRECT ANSWER the air brake system &
expels it when compressor reaches cut-out pressure
An alcohol evaporator adds - CORRECT ANSWER alcohol vapors in air brake system
to help prevent moisture from freezing
The brake pedal is used to apply the - CORRECT ANSWER service brakes
Front-wheel limiting valves reduce the force of - CORRECT ANSWER the service
brakes on the front steering axle
Pushrod stroke is produced by - CORRECT ANSWER compressed air entering the
brake chamber
QUESTIONS AND CORRECT ANSWERS
Brakes convert the energy of a moving vehicle into - CORRECT ANSWER heat
Hydraulic Brakes are used on passenger vehicles and use_______ to operate the brakes -
CORRECT ANSWER brake fluid
Air brakes are used on most large commercial vehicles and use _____ to operate the brakes -
CORRECT ANSWER compressed air
A split-second delay in brake reaction is present in ... - CORRECT ANSWER all air
brake systems
Vehicles with air brakes may use either - CORRECT ANSWER drum or disc brakes
Compressed air is a form of stored energy that can be - CORRECT
ANSWER hazardous
Air compressors are powered directly by - CORRECT ANSWER the engine or by
using belts and pulleys
Air compressors are mounted directly on - CORRECT ANSWER the engine or by
using brackets and fasteners
The governor controls - CORRECT ANSWER the air compressor cut-in and cut-out
pressure
The operating pressure range for vehicle air brake systems must be between - CORRECT
ANSWER (80 psi - 135 psi)
, It is unsafe to drive a vehicle when the air pressure is - CORRECT ANSWER outside
the normal operating range.
Compressed air is stored in - CORRECT ANSWER the vehicle's supply or 'wet' tank
and the primary and secondary air tanks
To prevent too much moisture and oil from collecting, - CORRECT ANSWER the air
tanks must be drained regularly
Air pressure gauges indicate air pressure in - CORRECT ANSWER the vehicle's
primary and secondary air tanks
Safety valves prevent - CORRECT ANSWER overpressure of the air brake system
Low air pressure warning devices give drivers - CORRECT ANSWER a visual &
sometimes audible warning that air pressure is dangerously low
An air dryer removes moisture from - CORRECT ANSWER the air brake system &
expels it when compressor reaches cut-out pressure
An alcohol evaporator adds - CORRECT ANSWER alcohol vapors in air brake system
to help prevent moisture from freezing
The brake pedal is used to apply the - CORRECT ANSWER service brakes
Front-wheel limiting valves reduce the force of - CORRECT ANSWER the service
brakes on the front steering axle
Pushrod stroke is produced by - CORRECT ANSWER compressed air entering the
brake chamber
